2011-12-21T22:53:24ZFluxBBhttp://www.mathisfunforum.com/viewtopic.php?id=17147That is not important because that is only an approximate answer. That is why I asked if you knew.

The exact answer I believe is:

The dn operator stands for the number of derangements.

The question was posed by Montmort in 1781 and answered by him and Bernoulli.

]]>http://www.mathisfunforum.com/profile.php?id=337902011-12-21T22:53:24Zhttp://www.mathisfunforum.com/viewtopic.php?pid=197237#p197237well how do you get the first probability,the 1-1/e one?]]>http://www.mathisfunforum.com/profile.php?id=1187862011-12-21T21:14:30Zhttp://www.mathisfunforum.com/viewtopic.php?pid=197212#p197212It is a standard derangement problem. Solved long ago. The probability of no fixed points in a permutation of {1,2,3,4,...n} approaches 1/ e.]]>http://www.mathisfunforum.com/profile.php?id=337902011-12-21T21:11:45Zhttp://www.mathisfunforum.com/viewtopic.php?pid=197207#p197207i think it is,but i am not sure.how did you get it?]]>http://www.mathisfunforum.com/profile.php?id=1187862011-12-21T21:03:04Zhttp://www.mathisfunforum.com/viewtopic.php?pid=197195#p197195Is it right?]]>http://www.mathisfunforum.com/profile.php?id=337902011-12-21T20:58:31Zhttp://www.mathisfunforum.com/viewtopic.php?pid=197187#p197187how did you get that?]]>http://www.mathisfunforum.com/profile.php?id=1187862011-12-21T20:57:58Zhttp://www.mathisfunforum.com/viewtopic.php?pid=197185#p197185Hi;

he didn't make it up.i think this problem was on a high school competition.

]]>http://www.mathisfunforum.com/profile.php?id=1187862011-12-21T20:32:55Zhttp://www.mathisfunforum.com/viewtopic.php?pid=197152#p197152Do you mean on the first draw or do they work their way all through the decks?]]>http://www.mathisfunforum.com/profile.php?id=1116052011-12-21T20:32:14Zhttp://www.mathisfunforum.com/viewtopic.php?pid=197151#p197151It is a standard problem, your professor is not very imaginative. Unfortunately I threw my solution away so please hold.]]>http://www.mathisfunforum.com/profile.php?id=337902011-12-21T20:31:26Zhttp://www.mathisfunforum.com/viewtopic.php?pid=197149#p197149how's it coming on bobbym?]]>http://www.mathisfunforum.com/profile.php?id=1187862011-12-21T20:29:31Zhttp://www.mathisfunforum.com/viewtopic.php?pid=197147#p197147Okay, thanks for that informatiuon. I am working on it.]]>http://www.mathisfunforum.com/profile.php?id=337902011-12-21T19:55:55Zhttp://www.mathisfunforum.com/viewtopic.php?pid=197099#p197099hi bobbym

exactly the same card.they have two standard decks without the jokers.